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Motor RPM Control
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Motor RPM Control Facts
Motor RPM Control is another view of the
controller and VFD drive technology. Previous articles have
referred to the variable speed aspect. However, it must be
stressed that specific RPM is also a control feature. Saying that
variable speed is achieved tends to be general and does not specify
that there might be a target RPM which is being met. Motor RPM
Controls are really there to provide exact RPMs for specific
Motor RPM Control & Application
Motor RPM Control establishes a certain
speed. This is the RPM and may or may not be the actual final
target. In some speed settings the result may be a number of
cubic feet of air in a given time, as in HVAC systems. In
VFD pump systems the
actual target may be a volume of fluid, like so many gallons per second
or minute. In machining operations, RPM is often the actual
target and is determined by an optimum speed at which machining does
its best job for existing circumstances. The Motor RPM Control
will allow adjustability in all cases so whatever final result is
desired can be achieved.
Motor RPM Control & The Motor
What if Motor RPM Control is applied to a
universal motor? (A universal motor is defined as series-wound,
capable of operating at either 50 or 60 Hz AC or DC.) Under no
load, speed is highest under no load. Torque is greatest under
lowest speed. This relationship of speed and torque means loads
can affect speed. Use of a universal motor is not prudent when
expected service under a constant speed.
Motor RPM Control & Torque Control
Motor RPM Controls usually have motors
which are specifically designed to match their use. One form of
variable speed drive addresses the problems of torque by providing
sensors on the shaft which monitor the phase positions. Through
this and an adjustment of position, torque can be controlled. A
second version has no sensors, but measures the power characteristics
of the motor. It then adjusts the real characteristics to match
as closely as possible to the ideal characteristics. This way the
motor reaches optimal conditions of speed and torque. Remember,
we are speaking now of torque as lack of sufficient torque will allow
the motor speed to be affected under loads. The Motor RPM
Control may sometimes use a vector drive to help maintain a true
RPM. ( But a
vector drive is often focused on torque despite RPM. A good
vector drive and motor can maintain 100% torque even with no RPMs.)
Motor RPM Control & Constant Speed Motors
A range of
DC motors exists which are great at maintaining constant speed.
A Motor RPM Control coupled with one of these can supply
variable speeds which can be set to accurate RPMs. These are
brushless motors and, being brushless, do not have the servicing
liabilities of the brushed DC motors (which are also used for constant
TEMCo Customer Policy
In order to best service our clients we at TEMCo
have evolved the ideal circumstances for them. We maintain that
customer confidence and customer satisfaction are based an a nucleus of
a limited, but vital number of factors. We strive to keep all of
these factors fully in practice so our customers are never let down and
so they remain loyal to us. They are six in number, and are
simple to state.
professional and accessible customer service that answers all questions
and provides help in choosing the best product for the application.
as fast as possible so the customer doesn't incur extra costly downtime
during repairs or new installations.
lifetime product support so the customer can always have someone to
help answer questions and evolve solutions to problems.
best warranty available. After all, we have confidence in the
fine products we make and sell.
most competitive prices.
Highest Quality Motor RPM Controls
Call TEMCo with your specific
needs. TEMCos technical sales department has many years of
applications experience providing design and engineering assistance for
all types of Motor RPM Control installations.
Call Our Motor RPM Control
RPM Control Voltage Combinations Available*
Contact our team at TEMCo
510-490-2187 to get your quote, place your order and arrange
Motor RPM Controls
Motor RPM Control
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Motor RPM Controls Manufactured to your Specs!
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Motor RPM Controls manufactured for sale throughout the U.S. and
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proper use. All models are backed by
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